Emissions from sweating and melting operations
consist of particulate, zinc fumes, other volatile metals, flux fumes, and smoke generated by the
incomplete combustion of grease, rubber, and plastics in zinc scrap. Zinc fumes are negligible at low
furnace temperatures. Flux emissions may be minimized by using a nonfuming flux. In production
requiring special fluxes that do generate fumes, fabric filters may be used to collect emissions.
Substantial emissions may arise from incomplete combustion of carbonaceous material in the zinc
scrap. These contaminants are usually controlled by afterburners.